Casio Computer Co., Ltd. is a multinational electronic devices manufacturing company founded in 1946, with its headquarters in Shibuya, Tokyo, Japan. Casio is best known for its calculators, audio equipment, PDAs, cameras, musical instruments, and watches. In 1957 Casio released the world's first entirely electric compact calculator.

Evolution Electronics is a UK based manufacturer of affordable software and hardware products for the computer musician. Founded in 1985 by Richard Watts, the company released the EVS-1 synthesizer in 1986, a synth that quickly achieved cult status. After years of successful design work for a string of well know companies, Evolution released the MK-149 keyboard, its first own brand computer music product.